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© Nelson Antoine/APA protester is detained by police during the demonstration in Sao Paulo
Within 10 minutes of the demonstration, officers had reportedly fired tear gas and sound bombs, and arrested one, according to local press.

Local people angry at the amount of public money being spent on the tournament have begun to carry out their threat of taking to the streets around the stadium where the opening ceremony will take place ahead of the first match.

The protest started in the east of São Paulo, which will host the opening ceremony of the World Cup from around 3pm local time (9pm UK time).

Meanwhile tanks were sent to Rio de Janeiro's main airport in anticipation of angry scenes after airport workers announced a 24-hour wildcat strike which is likely to affect thousands of fans flying in for Brazil 2014.

Twenty per cent of airport workers in Rio were expected to go on strike, affecting three airports: the international airport, and two domestic airports.

Longer queues than usual were reported.

About a dozen airport workers blocked a road outside one airport, causing long tailbacks.

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© Rodrigo ABD/APPolice fire rubber bullets at protestors in Sao Paulo, today
In Sao Paulo around 200 protesters tried to cut off a main road leading to the Corinthians Arena.

Police fired loud stun grenades to disperse the crowd.

About two hours later the demonstrators regrouped and threw stones at police as well as setting fire to rubbish a short distance from the initial clashes.

There were also reports that Molotov cocktails were thrown in the city near the municipal chamber.

There had been four protests planned in São Paulo this morning; the first began at 10am local time.

The demonstration closest to the Corinthians Arena, where Brazil will play Croatia later today, was reportedly invaded by a movement known as the People's World Cup, reported Folha de São Paulo.

A CNN producer called Barbara Arvanitidis was left bleeding after police used stun grenades.

The BBC's Wyre Davies helped administer first aid, and images appeared to show a journalist being tended to by paramedics.

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© Ricardo Moraes/ReutersCNN producer named as Barbara Arvanitidis receives medical attention
CNN journalist Shasta Darlington said: "Thank you to @WyreDavies and cordon of protesters who helped our @Arvanb01 after we were hit by canister at protest #CNNWorldCup"

At least one demonstrator was arrested in the clashes, where protesters carried a banner saying "If people don't get their rights there will be no World Cup".

Many Brazilians are angry about the £6.7 billion spent on hosting the World Cup in a country where millions of people live in slums and basic services such as healthcare are underfunded.

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© Nacho Doce/ReutersA protester throws a tear gas bomb after military police shot at protesters during the demonstration in Sao Paulo
Government ministers will be hoping for a home win in tonight's opening match against Croatia to bring a feel-good factor to the country.

Melisa da Silva, wearing Brazil's green and yellow colours as she headed to work in Sao Paulo, said: "Well, it's here, and I think now it's time to cheer the team. I don't see why people should still be sad."

Other strikes and protests are expected in the 12 host cities for the tournament. Some businesses in Rio have boarded up windows and doors in fear of rioting.